The calculation of users’ friendliness in Caiyin social networking services is the key for the user friendliness model. SNS counts for revelation of persons’ relation in real life.However
the revelation between people in SNS may always be out of focus. This paper will introduce the model for SNS users’ relation based on the users character in caiyin SNS
and will tell how to calculate the distance bewteen users in caiyin SNS based on the six degrees of separation